ES2887346T3 - Induction heating device and method for controlling the same - Google Patents

Abstract

An induction heating device, comprising: a charging plate (106) for placing a charged object thereon, the charging plate (106) having at least one heating region; at least one work coil (202, 204) disposed below the charging plate (106), wherein the work coil (202, 204) corresponds to a heating region; a charged object sensor (220) disposed in a central region of the work coil (202, 204); and a control unit (602) configured to determine whether a charged object having an inductive heating property is placed in the heating region by inductive detection using the charged object sensor (220) corresponding to the heating region and current detection using the work coil (202, 204) corresponding to the heating region, characterized in that: after determining the result of the inductive detection that a charged object having the property of inductive heating is placed in the region heating, the control unit (602) is configured to perform current detection of the corresponding charged object using the corresponding work coil (202, 204), wherein only upon determining that a charged object having the property of heating inductive is placed in the heating region from the current detection result, the control unit (602) and It is configured to perform a heating operation of the charged object by the corresponding work coil (202, 204), in which an amount of power consumed for inductive detection is set to be less than the amount of power consumed for detection. of current

Description

DESCRIPTION

Induction heating device and method for controlling the same

technical field

The present disclosure relates to an induction heating device and a method of controlling the same.

Related art

In homes and restaurants, cooking appliances may use various heating methods to heat a cooking vessel, such as a pot. Gas ranges, stoves, or other cookers may use synthetic gas (synthesis gas), natural gas, propane, butane, liquefied petroleum gas, or other flammable gas as a fuel source. Other types of cooking devices can heat a cooking container with electricity.

Cooking devices using electrically based heating can be generally classified as resistive type heating devices or inductive type heating devices. In electrical resistive heating devices, heat can be generated when current flows through a metal resistance wire or a non-metallic heating element, such as silicon carbide, and this heat from the heated element can be transmitted to an object. through radiation or conduction to heat the object. As described in more detail below, inductive heating devices can apply high-frequency power of a predetermined magnitude to a work coil, such as a copper coil, to generate a magnetic field around the work coil. and the magnetic induction of the magnetic field can cause an eddy current to be generated in an adjacent pot made of certain metals, so that the pot itself can heat up due to the electrical resistance of the eddy current.

In more detail, the principles of the induction heating scheme include applying a high frequency voltage (eg, an alternating current) of a predetermined magnitude to the work coil. Therefore, an inductive magnetic field can be generated around the work coil. When a pot containing certain metals or other inductive metals is placed on or near the work coil to receive the flux of the generated inductive magnetic field, an eddy current can be generated within the bottom of the pot. As the resulting eddy current flows into the bottom of the pot, the pot itself can heat up while the induction heating device remains relatively cool.

In this way, activation of the inductively heated device causes the pot to heat and not the load plate of the inductively heated device. When the pot is lifted or removed from the load plate of the induction heating device and moves away from the inductive magnetic field around the coil, the pot stops heating further, since the eddy current is no longer generated. Since the work coil in the induction heating device does not heat up, the temperature of the charging plate remains at a relatively low temperature even during cooking, and the charging plate remains relatively safe for the user to enter. contact with it. Also, by remaining relatively cool, the charging plate is easy to clean, as spilled food will not burn on the cold charging plate.

Furthermore, since the induction heating device heats only the pot by inductive heating and does not heat the load plate or other component of the induction heating device, the induction heating device is advantageously more energy efficient compared to the range gas or electric resistance heating device. Another advantage of an induction heated device is that it heats pots relatively faster than other types of heating devices, and the pot can be heated in the induction heating device at a rate that varies directly as a function of the applied magnitude of the device. induction heating, so that the amount and rate of induction heating can be carefully controlled by controlling the amount applied.

However, only pots that include certain types of materials, such as ferrous metals, can be used in the induction heating device. As described above, only a pot or other object in which the eddy current is generated when placed close to the magnetic field of the work coil can be used in the induction heating device. Because of this restriction, it may be useful to consumers for the induction heater to accurately determine whether a pot or other object placed on the induction heating device can be heated by magnetic induction.

In certain induction heating devices, a predetermined amount of power may be supplied to the work coil for a predetermined time, to determine if eddy current occurs in the pot. Induction heating devices can then determine, based on whether eddy current occurs in the pot, whether the pot is suitable for induction heating. However, according to this procedure, relatively high levels of power (eg, 200 W or more) can be used to determine the suitability of the pot for induction heating. Consequently, an improved induction heating device could accurately and quickly determine whether a pot is compatible with induction heating while it is being consumed.

EP 3026981 A1 discloses an induction cooktop with a panel, a plurality of induction heating coils arranged below the cooktop panel, and a plurality of detection coils arranged below the cooktop panel. .

SUMMARY

This summary is provided to introduce a selection of concepts in a simplified form which are further described below in the detailed description. This summary is not intended to identify all key features or essential features of the claimed subject matter, nor is it intended to be used alone as an aid in determining the scope of the claimed subject matter.

The present disclosure aims to provide an induction heating device capable of accurately and quickly discriminating the type of charged object while consuming less power than a conventional one, and to provide a method for controlling the induction heating device.

Furthermore, the present disclosure is intended to provide an induction heating device configured to simultaneously perform measurement of the temperature of the charged object and determination of the type of the charged object, and to provide a method for controlling the induction heating device.

Furthermore, the present disclosure is intended to provide an induction heating device by which the user can quickly and intuitively check whether the corresponding charged object has the property of inductive heating, and the user can skip the operation of pressing a select button. of heating region when the user charges the charged object and is intended to provide a method for controlling the induction heating device.

The purposes of the present disclosure are not limited to the purposes mentioned above. Other purposes and advantages of the present disclosure, as not mentioned above, can be understood from the following descriptions and more clearly understood from the embodiments of the present disclosure. Furthermore, it will be readily appreciated that the objects and advantages of the present disclosure may be realized by features and combinations thereof as described in the claims.

These objects are solved by the subject matter of the independent claims. Other advantageous embodiments and refinements are described in the respective dependent claims.

The present disclosure is to provide an induction heating device with a novel charged object sensor for accurately determining a type of charged object while consuming less power than the prior art.

The new charged object sensor according to the present disclosure has a hollow cylindrical body with a detection coil wound on an outer face thereof. Furthermore, a temperature sensor is housed in a receiving space formed within the charged object sensor body.

The charged object sensor having such a configuration is disposed in a central region of the work coil and concentric with the coil. The sensor can determine the type of charged object placed at the position corresponding to the work coil, and at the same time measure the temperature of the charged object.

In particular, the detection coil included in the charged object sensor according to the present disclosure has fewer rotation counts and a shorter overall length than that of the work coil. Therefore, the sensor according to the present invention can identify the type of the charged object while consuming less power in comparison with the charged object discrimination method using the conventional work coil.

Also, as described above, the temperature sensor is housed in the internal space of the charged object sensor according to the present disclosure. Therefore, there is an advantage that the temperature can be measured, and the type of the charged object can be determined at the same time by using the sensor, which has a smaller size and volume than the conventional one.

According to the present disclosure, the combination of current sensing using the work coil and inductive sensing using the charged object sensor can allow the type of charged object to be accurately and quickly discriminated. In this regard, inductive sensing can consume less power than current sensing. According to the present disclosure, first, inductive detection is performed periodically after applying power to the induction heating device, to detect a specific object with inductive heating property. Next, current detection of the specific object having inductive heating property is performed to check whether the specific object has inductive heating property again. Thus, when the user simply places the charged object on the charging plate of the induction heating device, the device can allow the user to quickly and intuitively confirm whether the corresponding charged object has the property of inductive heating. Therefore, an operation of pressing the heating region selection button by the user after loading the loaded object can be omitted.

For those purposes, according to a first aspect of the present disclosure, there is provided an induction heating device comprising: a charging plate on which a charged object is placed, wherein the charging plate has at least one heating region; at least one work coil disposed below the charging plate for heating a corresponding charged object using inductive current, wherein each work coil corresponds to each heating region; a charged object sensor disposed concentrically with each work coil, wherein each work coil surrounds each sensor; and a control unit configured to determine whether a charged object placed in a corresponding heating region has an inductive heating property by at least one of current detection using a corresponding work coil, and inductive detection using a corresponding charged object sensor . The sensor preferably includes a detection coil.

In one embodiment of the device, the at least one heating region includes a plurality of heating regions. The control unit is configured to repeatedly perform inductive detection of all heating regions in a predetermined detection interval.

In an embodiment of the device, by determining from the inductive detection result that a corresponding charged object is determined to have the property of inductive heating, the control unit is configured to perform current detection of the corresponding charged object using a coil of corresponding job.

In one embodiment of the device, the at least one heating region includes a plurality of heating regions, wherein the control unit is configured to perform current sensing of all heating regions upon an initial application of power to the device. .

According to the present invention, the control unit is configured to allow a corresponding work coil to perform the heating operation of a corresponding charged object only when it is determined that said corresponding charged object, from the current detection result, It has the property of inductive heating.

In an embodiment of the device, when an eddy current magnitude generated in a corresponding charged object in current detection when current is applied to a corresponding work coil exceeds a first predetermined reference value, the control unit is configured to determine that the corresponding charged object has an inductive heating property.

In an embodiment of the device, when a phase value of the current measured in a corresponding detection coil in inductive detection when current is applied to the corresponding detection coil exceeds a second predetermined reference value, the control unit is configured to determine that a corresponding charged object has an inductive heating property.

In an embodiment of the device, when an inductance value measured at a corresponding detection coil in inductive detection when current is applied to the corresponding detection coil exceeds a predetermined third reference value, the control unit is configured to determine that a Corresponding charged object has an inductive heating property.

According to the present invention, the amount of power consumed for inductive detection is set to be less than the amount of power consumed for current detection.

According to a second aspect of the present disclosure, a method of controlling an induction heating device is provided; wherein the method comprises: inductively detecting at least one or each region of heating; upon determining based on inductive detection that a specific charged object disposed in a specific heating region has an inductive heating property, performing current detection of the specific heating region and/or the object; and after determining based on the current detection that the specific charged object has an inductive heating property, performing the heating operation of the specific charged object. The device may be an induction heating device according to any one of the embodiments described herein. The device preferably has at least one heating region, where each heating region corresponds to each charged object disposed thereon.

In one embodiment of the method, the at least one heating region includes a plurality of heating regions, wherein the method further comprises: performing initial current sensing of all heating regions after an initial application of power to the device; determining based on the initial current detection whether each charged object disposed in each heating region or whether a charged object disposed in an initially detected heating region has an inductive heating property; and performing the heating operation on a charged object determined to have the property of inductive heating.

In one embodiment of the method, the inductive detection of at least one or each region of heating is repeated at a predetermined interval.

According to the present disclosure, the induction heating device and the method for controlling the same can be capable of accurately and quickly discriminating the type of charged object while consuming less power than a conventional one.

Furthermore, according to the present disclosure, the induction heating device and the method for controlling the same can simultaneously perform measurement of the temperature of the charged object and determination of the type of the charged object.

Furthermore, the induction heating device and the method for controlling the same can allow the user to quickly and intuitively check whether the corresponding charged object has the property of inductive heating, and can allow the user to skip the operation of pressing a selection button. heating region when the user charges the charged object.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments will be described in detail with reference to the following drawings, in which like reference numbers refer to like elements, in which:

Figure 1 is a schematic representation of an induction heated device according to one embodiment of the present disclosure;

Fig. 2 is a perspective view showing a structure of a work coil assembly included in an induction heating device according to an embodiment of the present disclosure; Figure 3 is a perspective view showing a coil base included in the work coil assembly according to an embodiment of the present disclosure;

Figure 4 shows a configuration of a charged object sensor according to one embodiment of the present disclosure;

Figure 5 is a vertical cross-sectional view of a body included in a charged object sensor according to an embodiment of the present disclosure;

Figure 6 is a circuit diagram illustrating an inductive detection method using a charged object sensor in one embodiment of the present disclosure;

Figure 7 is a circuit diagram illustrating a current sensing method using a work coil in one embodiment of the present disclosure;

Figure 8 shows a manipulation region of the induction heated device according to one embodiment of the present disclosure;

Figure 9 is a flow chart of a method for controlling an induction heating device according to an embodiment of the present disclosure;

Figure 10 is a flow chart of a method for controlling an induction heating device according to another embodiment of the present disclosure.

DETAILED DESCRIPTION

In the following description, numerous specific details are set forth in order to provide a complete understanding of the present disclosure.

Figure 1 is a schematic representation of an induction heated device 10 according to one embodiment of the present disclosure. Referring to Figure 1, an induction heating device 10 (also called an induction cooktop or induction cooktop) according to one embodiment of the present disclosure may include a housing 102 that constitutes a main body or outward appearance of the device 10. induction heating element, and a cover plate 104 attached to the casing 102 to seal the casing 102.

Cover plate 104 may be attached to a top face of housing 102 to seal a defined space within housing 102 from the outside. Cover plate 104 may include a load plate 106 on which a user can selectively place an object to be heated by an inductive magnetic flux. As used herein, the phrase "loaded object" generally refers to a cooking vessel, such as a saucepan or pot, placed on the load plate 106 . In one embodiment of the present disclosure, the load plate 106 may be made of a tempered glass material, such as a glass ceramic.

Referring again to Figure 1, one or more sets of work coils (or work coils) 108, 110 may be provided to heat the charged object in a space formed within the casing 102. In addition, the The interior of housing 102 may also include an interface 114 that allows a user to control induction heating device 10 to apply power, allows a user to control the output of work coil assemblies 108 and 110, and displays related information. to a state of the induction heating device 10. Interface 114 may include a touch panel capable of both displaying information and inputting information by touch. However, the present disclosure is not limited thereto, and depending on the embodiment, an interface 114 may include a keyboard, trackball, lever, buttons, switches, knobs, dials, or other various input devices for receiving input. Username. In addition, interface 114 may include one or more sensors, such as a microphone to detect user audio input and/or a camera to detect user movement, and a processor to interpret the captured sensor data to identify user input. Username.

In addition, load plate 106 may include a tamper region (or interface cover) 118 provided at a position corresponding to interface 114. To direct user input, tamper region 118 may be pre-printed with characters, images, or characters. Similar. The user can perform a desired manipulation by touching a specific point in the manipulation region 118 corresponding to the preprinted character or image. In addition, the information generated by the interface 114 can be displayed through the load board 106.

In addition, in the space formed within the housing 102, a power supply 112 may be provided for supplying power to the work coil assemblies 108, 110 and/or interface 114. For example, the power supply 112 may be provided. coupled to a commercial power supply and may include one or more components that convert commercial power for use by work coil assemblies 108, 110 and/or interface 114.

In the embodiment of FIG. 1, the two work coil assemblies 108 and 110 are shown within housing 102. It should be appreciated, however, that the induction heating device 10 may include any number of work coil assemblies 108, 110. work coils. For example, in other embodiments of the present disclosure, induction heating device 10 may include a work coil assembly 108 or 110 within housing 102, or may include three or more work coil assemblies 108, 110.

Each of the work coil assemblies 108 and 110 may include a work coil that generates an inductive magnetic field using a high-frequency alternating current supplied thereto by a power source 112, and a thermal insulation sheet 116 to protect the work coil. the work coil from the heat generated by the charged object on the cover plate. In certain embodiments of the induction heating device 10, the thermal insulation sheet 116 may be omitted.

Although not shown in Figure 1, a control unit (such as control unit 602 in Figure 6), also referred to herein as a controller or processor, may be provided in the space formed within the housing 102. The control unit may receive a user command through the interface 114 and may control the power supply 112 to turn the power supply to the work coil assembly 108, 110 on or off based on the user command.

Next, with reference to Figs. 2 and 3, a structure of the work coil assembly 108, 110 included in the inductively heated device 10 according to the embodiment will be described in detail. For example, Fig. 2 provides a perspective view showing a structure of a work coil assembly included in an induction heating device, and Fig. 3 is a perspective view showing a coil base included in the assembly. of work coil.

The work coil assembly according to one embodiment of the present disclosure may include a first work coil 202, a second work coil 204, and a coil base 206. The first work coil 202 may be mounted on the coil base 206 and may be circularly wound a first number of times (eg, a first count of rotation) in a radial direction. In addition, a second work coil 204 may be mounted on the coil base 206 and may be circularly wound around the first work coil 202 a second number of times (eg, a second count of rotation) in the radial direction. Therefore, the first work coil 202 may be located radially inside and in the center of the second work coil 204.

The first rotation count of the first work spool 202 and the second rotation count of the second work spool 204 may vary depending on the embodiment. The sum of the first rotation count of the first work coil 202 and the second rotation count of the second work coil 204 may be limited by the size of the coil base 206 and the configuration of the induction heating device 10 . and the wireless power transmission device.

Both ends of the first work spool 202 and both ends of the second work spool 204 may extend out of the first work spool 202 and the second work spool 204, respectively. Connectors 204a and 204b can be connected to the two ends of the first work coil 202, respectively, while connectors 204c and 204d can be connected to the two ends of the second work coil 204, respectively. The first work coil 202 and the second work coil 204 may be electrically connected to the control unit (such as control unit 602) or power supply (such as power supply 112) via connectors 204a. , 204b, 204c and 204d. According to one embodiment, each of the connectors 204a, 204b, 204c and 204d can be implemented as a conductive connection terminal.

Coil base 206 may be a structure for accommodating and supporting first work coil 202 and second work coil 204 . Coil base 206 may be made of or include a non-conductive material. In the region of the coil base 206 where the first work coil 202 and the second work coil 204 are mounted, receptacles 212a to 212h may be formed in a lower part of the coil base 206 for receiving magnetic sheets, such as magnetic sheets. 314a-314h of ferrite described below.

As shown in Figure 3, pockets 312a through 312h (corresponding to pockets 212a through 212h in Figure 2) may be formed in the lower portions of coil base 206 to receive and accommodate ferrite sheets 314a through 314h. . Receptacles 312a through 312h may extend in the radial direction of first work coil 202 and second work coil 204. The ferrite sheets 314a to 314h may extend in the radial direction of the first work coil 202 and the second work coil 204. It should be appreciated that the number, shape, position, and cross-sectional area of the ferrite sheets 314a to 314h may vary in different embodiments. Furthermore, although the ferrite sheets 314a to 314h are designated as "ferrite", they may include various non-ferrous materials.

As shown in Figure 2 and Figure 3, the first work coil 202 and the second work coil 204 may be mounted on the coil base 206. A magnetic sheet may be mounted below the first work coil 202 and the second work coil 204. This magnetic sheet can prevent the flux generated by the first work coil 202 and the second work coil 204 from being directed below the coil base 206. Preventing the flux from being directed below the coil base 206 can increase the density of the flux produced by the first work coil 202 and the second work coil 204 towards the charged object.

Meanwhile, as shown in Fig. 2, a charged object sensor 220 according to an embodiment of the present disclosure may be provided in the central region of the first work coil 202. In the embodiment of Fig. 2, the charged object sensor 220 may be provided concentric with the first work coil 202, but the present disclosure is not limited thereto. Depending on the embodiment, the position of the charged object sensor 220 may vary.

On the outer face of the charged object sensor 220, a detection coil 222 may be wound by a predetermined rotation count. Both ends of the detection coil 222 may be connected to connectors 222a and 222b, respectively. Detection coil 222 may be electrically connected to the control unit (such as control unit 602) or to a power source (such as power source 112) via connectors 222a and 222b. The control unit may manage the power supply to supply current to detection coil 222 through connectors 222a and 222b of charged object sensor 220 to determine the type of charged object, as described below.

Figure 4 shows a configuration of a charged object sensor 220 according to one embodiment of the present disclosure. Referring to Figure 4, the charged object sensor 220 according to one embodiment of the present disclosure may include a cylindrical hollow body 234 . The space formed within the hollow cylindrical body 234 can be defined as a first receiving space.

A detection coil 222 may be wound by a predetermined number of windings around an outer surface of the hollow cylindrical body 234 . Both ends of the detection coil 222 can be connected to connectors 222a and 222b for electrical connection to other devices. Detection coil 222 may be electrically connected to a control unit (such as control unit 602) and/or a power source (such as power source 112) via connectors 222a and 222b.

In one embodiment of the present disclosure, the control unit (such as control unit 602) may determine a type or other attribute of the loaded object. For example, the control unit may determine whether the charged object is suitable for induction heating based on, for example, the change in inductance value or current phase of the detection coil 222 when current is applied. to the detection coil 222 via the power supply.

In addition, the charged object sensor 220 may include a magnetic core 232 that is receivable in the first receiving space of the hollow cylindrical body 234 and may have a substantially cylindrical shape. Magnetic core 232 may be made of or otherwise include a material characterized by magnetism, such as ferrite. The magnetic core 232 can increase the flux density induced in the detection coil 222 when a current flows through the detection coil 222. Magnetic core 232 may have a hollow, substantially cylindrical shape that includes a second receiving space defined therein.

Within the second receiving space of the magnetic core 232, a temperature sensor 230 can be received. Temperature sensor 230 may be a sensor that measures the temperature of the charged object. Temperature sensor 230 may include cables 230a and 230b to provide an electrical connection to other devices, such as a control unit or power supply. Leads 230a and 230b of temperature sensor 230 can be extended to pass outside through an opposite side of magnetic core 232 and the other side of body 234 hollow cylinder through the first and second receiving spaces.

Figure 5 is a longitudinal section of the hollow cylindrical body 234 of the charged object sensor 220 according to one embodiment of the present disclosure. As shown in Figure 5, the hollow cylindrical body 234 of the charged object sensor 220 may have a hollow cylindrical vertical portion 234a (or cylindrical wall), a first flange 234b extending horizontally from the top of the vertical portion 234a (or a first axial end adjacent to load plate 106), and a second flange 234c extending from the bottom of vertical portion 234a (or a second axial end opposite load plate 106).

The first flange 234b can extend along the outer face of the upper end of the vertical portion 234a, so that the magnetic core 232 can freely move downward in the first receiving space of the hollow cylindrical body 234. In addition, the second flange 234c may include a support portion 236 (or internal flange) to support the magnetic core 232 and block further downward movement of the magnetic core 232 when the magnetic core 232 is received in the first receiving space within the body 234 hollow cylindrical.

In addition, a hole 238 providing a through passage for the leads 230a and 230b of the temperature sensor 230 may be defined in the support portion 236 of the second flange 234c. Temperature sensor leads 230a and 230b may pass through the bottom of magnetic core 232 and through hole 238 to extend out of hollow cylindrical body 234 . Wires 230a and 230b of temperature sensor 230 that are exposed through hole 238 may be electrically connected to the control unit (such as control unit 602) or power source (such as power source 112).

In Fig. 4 and Fig. 5, the temperature sensor 230 and the magnetic core 232 can be inserted vertically in the direction from the first flange 234b to the second flange 234c (eg, downward). However, in another embodiment of the present disclosure, temperature sensor 230 and magnetic core 232 may be inserted in an upward direction through second flange 234c and toward first flange 234b. In this configuration, the support portion 236 having the wire hole 238 defined therein may be included in the first flange 234b.

As described with reference to Figures 4 and 5, the charged object sensor 220 according to the present disclosure can determine one type or another attribute of the charged object using the current flowing in the detection coil 22, and at the same time , the temperature of the charged object can be measured using the temperature sensor 230. Because the temperature sensor 230 can be received within the hollow cylindrical body 234, the overall size and volume of the sensor can be reduced, making placement and space utilization of the sensor within the inductively heated device more flexible.

Figure 6 is a circuit diagram illustrating an inductive detection method using a charged object sensor 220 in one embodiment of the present disclosure. Referring to Figure 6, a control unit (or controller) 602 in accordance with the present disclosure can manage a power supply (such as power supply 112) to apply an alternating current Acos(wt) having an amplitude A predetermined and a phase value wt to the detection coil 222 of the charged object sensor 220. After applying the AC power to the sensing coil 222, the control unit 602 may include a sensor to receive the AC current through the sensing coil 222 and analyze the components of the received AC current to determine changes in the attributes. of alternating current, such as a phase change or induction. As used herein, the determination of the type of charged object by applying the current to the detection coil 222 can be defined as inductive detection.

When there is no charged object near the detection coil 222 or the charged object is not a non-inductive object that does not contain an appropriate metallic component, the phase value wt+$ of the alternating current Acos(wt+$) received through the detection coil 222 does not show a large difference ($) from the phase value wt of the alternating current before being applied to the detection coil 222. This relative lack of a phase shift can be interpreted to mean that the inductance value L of the sensing coil 222 does not change much, since (1) there is no charged object near the sensing coil 222, or (2) the charged object does not contain an appropriate metallic component and is therefore not inductive.

However, if the charged object in the vicinity of the detection coil 222 contains an appropriate metal that is inductive (for example, includes iron, nickel, cobalt, and/or some rare earth metal alloys), magnetic inductive phenomena occur. and electrical between the charged object and the detection coil 222. Therefore, a relatively large change in the inductance value L of the detection coil 222 may occur. Therefore, the change in the inductance value L can greatly increase a change $ of the phase value wt+$ of the alternating current Acos(wt+$) received through the detection coil 222.

Accordingly, the control unit 602 can apply the alternating current Acos(wt) having a predetermined amplitude A and phase value wt to the detection coil 222 of the charged object sensor, and then determine the type of the charged object. near the duty coil 222 based on an attribute of the applied input AC current and the received output current from the sense coil 222. In one embodiment of the present disclosure, the control unit 602 may apply the alternating current Acos(wt) having a predetermined amplitude A and a phase value wt to the detection coil 222 of the charged object sensor 220, the AC current received through the coil 222 sense can be converted to the alternating current Acos(wt+$) with the phase value wt+$. In this context, when the phase shift $ for the alternating current Acos(wt+$) exceeds a first predetermined reference value, the control unit 602 can determine that the charged object has an induction heating property. Alternatively, when the phase shift $ of the alternating current Acos(wt+$) does not exceed the first predetermined reference value, the control unit 602 may determine that the charged object does not have an induction heating property or that there is no induction heating property. object positioned on the loading plate 106.

In another embodiment of the present disclosure, the control unit 602 may apply the alternating current Acos(wt) having a predetermined amplitude A and a phase value wt to the detection coil 222 of the charged object sensor, the control unit can measure an inductance value L of the detection coil 222. When the measured inductance value L of the detection coil 222 exceeds a second predetermined reference value, the control unit 602 can determine that the charged object has an inductive heating property. In this regard, when the measured inductance value L of the detection coil 222 does not exceed the second predetermined reference value, the control unit 602 can determine that the charged object does not have an inductive heating property or cannot be provided. no object on loading sheet 106.

In this way, when the control unit 602 determines that an object (for example, a cooking container) is placed on the charging plate 106 and the charged object has an inductive heating property, the control unit 602 can perform a heating operation by applying an electrical current to the work coils 202, 204 based on, for example, a heating level designated by the user through the interface 114.

During the heating operation, the control unit 602 may measure the temperature of the object currently being heated using the temperature sensor housed within the loaded object sensor. When controlling the current applied to the work coils 202, 204, the control unit 602 may, for example, apply a particular current level based on the heating level selected by the user when the control unit 602 determined, in based on the charged object sensor 220, that a cooking vessel is positioned in the work coils 202, 204 and has appropriate induction heating characteristics. Control unit 602 may then determine the temperature of the cooking vessel using temperature sensor 230 and may modify or stop current to work coils 202, 204 based on the sensed temperature and selected heating level, such as to reduce or stop the current when the detected temperature of the cookware equals or exceeds the selected heating level. Similarly, the control unit 602 may determine based on, for example, an attribute of a current received from the detection coil 222 of the charged object sensor 220, when the cooking container is removed from the detection coils 202, 204. work, and can stop the current to the work coils 202, 204.

When charged object detection is performed using charged object sensor 220 in accordance with the present disclosure, the power supplied to detection coil 222 for charged object detection may typically be less than 1 W, since coil 222 detection can be relatively small and generates a relatively small magnetic field. The magnitude of this power to the detection coil 222 may be very small compared to the power conventionally supplied to the work coil of the work coil assembly 108, 110 (greater than 200 W) when detecting the presence and composition of the charged object sensor.

In one embodiment of the present disclosure, control unit 602 may be programmed to repeatedly apply AC power to detection coil 222 at a particular time interval (eg, 1 second, 0.5 seconds, or other interval) to determine whether an object loaded in the induction heating device 10 has an inductive heating property (eg, has a suitable material and physical form to be heated by the flow of a generated inductive magnetic field). Control unit 602 may analyze the resulting output current (eg, phase changes and/or induction) to determine the presence and composition of the charged object. When the control unit 602 performs such repetitive current application and output current analysis, the type and presence of the charged object can be determined in near real time (eg, within the test interval) by the control unit 602 provided that the user places the object in or removes the object from the induction heating device 10 after power is applied to the induction heating device 10.

Figure 7 is a circuit diagram illustrating a current sensing method using a work coil in one embodiment of the present disclosure. Referring to Fig. 7, control unit 602 may apply an alternating current Acos(wt) having a predetermined amplitude A and phase value wt to work coil 202.

If the charged object that is close to the work coil 202 has an inductive heating property, such as including at least one layer of an appropriate metal in a close position (for example, at least partially within an inductive field formed by the detection coil 222), the alternating current Acos(wt) applied to the work coil 202 can cause magnetic and electrical inductive phenomena between the charged object and the work coil 202. Consequently, an eddy current can occur in the charged object. In this situation, the magnitude of the eddy current around the work coil 202 may increase.

However, when there is no charged object near the work coil 202 (for example, at least partially within an inductive field formed by the sense coil 222), or the charged object is non-inductive and does not contain a metallic component. appropriate, the magnetic and electrical inductive phenomenon between the charged object and the work coil 202 does not occur. As a result, the magnitude of the eddy current around the work coil 202 does not increase.

Consequently, after the control unit 702 applies the alternating current Acos(uit) to the work coil 202, the control unit 702 can measure the magnitude of the eddy current that is produced around the work coil 202 at through a current sensor 702. When the measured eddy current magnitude exceeds a third predetermined reference value, the control unit 702 can determine that the charged object has an inductive heating property and can be heated by the inductive heating device. In the present disclosure, determining the type of charged object based on the magnitude of the eddy current that occurs in the charged object when current is applied to the work coil 202, as described above, can be defined as "current sensing". ". In one embodiment, control unit 702 may repeatedly apply AC current to work coil 202, 204 at a particular time interval (eg, 1 second, 0.5 seconds, or other interval) to use current detection. to identify when the charged object is removed from the charging plate 106.

Figure 8 shows the manipulation region 118 located on the load plate 106 of Figure 1 according to one implementation. As shown in FIG. 8, the manipulating region 118 may include heating region selection buttons 802a, 804a, and 806a which may respectively indicate the positions of the heating regions included in the induction heating device. Manipulation region 118 may include a heating power selection button 810 that controls the heating power of (eg, the induction current applied to the work coils) each heating region. In Fig. 8, information about the three heating regions can be displayed in the manipulation region 118, but the present disclosure is not limited thereto. The number of heating regions included in the induction heating device may vary depending on different embodiments.

Further, the current heating powers of the corresponding heating regions may be respectively indicated by corresponding numbers in the heating power display regions 802b, 804b and 806b. In addition, the tamper region 118 may include a turbo display region (not shown) that indicates a state in which a particular heating region is undergoing rapid heating.

The user can place the loaded object in one of three heating regions, and the following discussion provides an example where the user places a cooking container in the second heating region. Next, the user may touch the second heating region selection button 804a. The user may then submit an input identifying the heating power to be applied to the charged object placed in the corresponding heating region by touching the heating power selection button 810 . The induction heating device then determines whether the charged object in the user-selected second heating region has an inductive heating property, such as by using the charged object sensor 220 described above. When the corresponding charged object has an inductive heating property, the inductive heating device 10 can apply a current to a work coil corresponding to a corresponding heating region to perform a heating operation to reach the heating power designated by the user. .

In this context, when the charged object placed in the second heating region has an inductive heating property, the heating power inputted by the user through the heating power selection button 810 may be displayed as a number in the region 804b. heating power display corresponding to the second heating region. On the contrary, when the charged object placed in the second heating region does not have the above inductive heating property, the heating power display region 804b corresponding to the second heating region may be marked with a number or letter (for example, by displaying a letter "u") to indicate that the corresponding charged object is not compatible with non-inductive heating (for example, it does not have the property of inductive heating).

After the user places the loaded object in a certain heating region, the user can specify the specific heating region to be heated by touching the loaded object selection button. However, as described above, according to the present disclosure, a current can be applied to the charged object sensor detection coil 222 repeatedly in a predetermined time interval, and thus the type of charged object is determined. can determine based on the result of the current application. In this case, when the user places the charged object in any heating region, the type of the charged object can be determined substantially immediately after the predetermined time interval elapses. For example, when the user places the object with inductive heating properties in the second heating region, the induction heating device may not wait for user input heating region selection buttons 802a, 804a, or 806a, but may indicate that the second heating region is available to heat the cooking vessel in the heating power display region 804b corresponding to the second heating region using a character or number (for example, 0).

When such a letter or number is displayed, the user can enter a heating power to apply to the corresponding heating region by touching the heating power selection button 810 . Then, the heating power input may be displayed in the heating power display region 804b. The induction heating device 10 then applies a current to the work coil 202, 204 such that the heating power of the corresponding heating region reaches the heating power level associated with user input.

When the user places a non-inductive heating charged object in the second heating region, a number or letter (for example, u) to indicate that the corresponding charged object is a non-inductive heating charged object or is not correctly positioned with respect to to the work coil 202, 204, according to the charged object determination method as described above, can be displayed in the heating power display region 804b corresponding to the second heating region.

In accordance with the present disclosure, after the user places an object with inductive heating properties in any heating region, the user can input a desired heating power and start the heating operation without having to press the button 802a, 804a. , or heating region selection 806a. That is, the induction heating device 10 according to certain embodiments of the present disclosure may eliminate the input operation for selecting the user's heating region.

In addition, according to the present disclosure, when the user places a charged object in any heating region, the device can display, in each heating power display region, within a relatively short period of time, whether the object corresponding charged has an inductive heating property. Therefore, the user can intuitively and quickly check the type of loaded object.

Next, a method for controlling an induction heating device according to the present disclosure using current detection and inductive detection will be described in detail. Figure 9 is a flow chart of a method for controlling an induction heating device according to an embodiment of the present disclosure.

Referring to FIG. 9, the control unit 602 may first perform inductive detection of one or more heating regions on the charging plate 106 of the induction heating device (step 902). In one embodiment of the present disclosure, control unit 602 may repeatedly perform inductive detection of all heating regions on charging plate 106 at a predetermined detection interval (eg, 0.5 seconds or 1 second).

If it is determined from the inductive detection that the charged object placed in any heating region has an inductive heating property, the control unit 602 may perform current detection of the charged object placed in the corresponding heating region (step 904 ). That is, the control unit 602 may first determine the type of the charged object by inductive detection, and then the control unit 602 may perform current detection of the charged object determined to have the property of inductive heating.

Thus, when it is determined by current detection that the charged object placed in the corresponding heating region has an inductive heating property, the control unit 602 can perform a corresponding charged object heating operation (step 906). For example, the control unit 602 may determine from the inductive detection and subsequent current detection that the second heating region has an optimal inductive heating property. Therefore, the control unit 602 may allow the heating power display region 804b of FIG. 8 corresponding to the second heating region to display a letter or number (for example, the number 0) indicating that the corresponding second heating region is available.

When the letter or number is displayed, the user can enter a heating power to apply to the corresponding heating region by one touch of the heating power selection button 810 . The input heating power is then displayed in heating power display region 804b. Subsequently, the induction heating device 10 can perform the heating operation by applying current to the work coil corresponding to the second heating region so that the heating power of the second heating region reaches the heating power inputted by the induction heating device. Username.

Inductive sensing as described above can use less power compared to current sensing to detect whether the charged object has inductive heating property. However, it is possible that the accuracy of inductive detection is not guaranteed due to sudden temperature change around the coil or other environmental factors, or noise generation. Therefore, according to the present disclosure, if it is first determined from inductive detection that the charged object has the property of inductive heating, then current detection can confirm that the determination of inductive detection is correct. This makes it possible to determine more reliably whether the charged object has the property of inductive heating.

Meanwhile, although not shown in Fig. 9, in the control method according to the present disclosure, when power is first applied to the present device, current detection of all heating regions can be performed first. which the objects are loaded. When it is determined from the current detection result that a specific charged object has the property of inductive heating, a heating operation can be performed on the specific charged object. The number of times current detection is performed when power is first applied to the device may vary by implementation.

For example, current detection of all heating regions can be performed once at the time power is applied to the induction heating device. In this way it is determined which of the charged objects corresponding to the heating regions have inductive heating properties. When it is determined from this initial current detection result that a specific one of the charged objects has an inductive heating property, the heating operation of the specific object can be performed substantially immediately. Otherwise, when it is determined from the initial current detection result that there are no objects with the property of inductive heating, subsequent periodic inductive detection as described above may be performed to identify the objects with the property of inductive heating.

Figure 10 is a flow chart of a method for controlling an induction heating device according to another embodiment of the present disclosure. Referring to FIG. 10, power may be applied to the induction heating device 10 based on user input, and thus, operation of the induction heating device may begin (step 1002). Then, the control unit 602 performs current detection by applying an alternating current having a predetermined amplitude and phase value to each of the work coils 202, 204 corresponding to all existing heating regions in the heating device. by induction (step 1004).

The control unit 602 can determine from the initial current detection result in step 1004 whether the object in any heating region has an inductive heating property (step 1006). If it can be determined from the above determination result that an object placed in an arbitrary heating region has an inductive heating property, then the control unit 602 can perform a heating operation of the heating region corresponding to the object. as determined to have the property of inductive heating (step 1006).

For example, the control unit 602 may determine from the determination in operation 1006 that the object corresponding to the second heating region has an inductive heating property. In this situation, the heating power display region corresponding to the second heating region may indicate a letter or a number (eg, 0) indicating that the corresponding heating region may be available. When the letter or number is displayed, the user can enter a heating power to apply to the corresponding second heating region by a touch of the heating power selection button 810 . The input heating power can then be displayed in the heating power display region. Next, the control unit 602 may apply a current to the work coil 202, 204 to perform a heating operation so that the heating power of the heating region corresponding to the charged object reaches the heating power inputted by the Username.

If it is determined from the determination in step 1006 that none of the objects corresponding to the heating regions have the property of inductive heating, the control unit 602 may repeatedly perform inductive detection of all heating regions in an interval predetermined detection method (step 1008). For example, the control unit 602 may perform inductive detection by applying an alternating current to the detection coil 222 of a charged object sensor 220 provided in the central region of the working coil 202, 204 corresponding to each heating region every 0 ,5 seconds.

The control unit 602 can determine from the result of the inductive detection in step 1008, which objects in the heating regions have the property of inductive heating (step 1010). If it can be determined from the determination result in step 1010 that a specific object corresponding to the specific heating region has the property of inductive heating, the control unit 602 can perform current detection of the corresponding heating region. to the specific object determined to have the property of inductive heating (step 1012). As described above, the accuracy of inductive sensing can vary depending on changes in temperature around the coil or other environmental factors, or noise generation. Therefore, according to the present disclosure, the control unit 602 can first determine from inductive detection whether the charged object has the heating property inductive, and then, the control unit 602 may perform current detection to confirm that the inductive detection determination is correct. This procedure makes it possible to determine more reliably whether the charged object has the property of inductive heating.

The control unit 602 may determine from the current detection result in step 1012 whether the charged object determined to have the inductive heating property from the inductive detection in step 1008 has an inductive heating property ( step 1014). If it is determined from the determination result in step 1014 that the charged object, which was initially determined to have the property of inductive heating from the inductive detection in step 1008, actually does not have the property of inductive heating , the control unit 602 may return to step 1008 and may perform periodic inductive detection of one or more of the heating regions again.

However, if it is determined from the determination result in step 1014 that the charged object, initially determined to have the property of inductive heating from the inductive detection in operation 1008, actually has the property of inductive heating based on current detection, then the control unit 602 can perform a heating operation of the heating region corresponding to the object (step 1016). For example, the control unit 602 may determine from the determination in step 1014 that the object positioned in the second heating region has an inductive heating property. In this situation, the heating power display region corresponding to the second heating region may indicate a letter or a number (eg, 0) indicating that the corresponding heating region may be available. When the letter or number is displayed, the user can submit an input identifying a heating power to be applied to the corresponding second heating region by a touch of the heating power selection button. The input heating power can then be displayed in the heating power display region. Next, the control unit 602 may apply a current to the work coil to perform a heating operation so that the heating power of the heating region corresponding to the object reaches the heating power inputted by the user.

Eventually, according to the present disclosure, the detection procedure performed by operation 1004 to operation 1006 or the detection procedure performed by operation 1008 to operation 1014 may allow the control unit to better determine whether the loaded object has the property of inductive heating substantially immediately after the user loads an object on the loading plate of the heating device. This determination result can be intuitively provided to the user in the heating power display region shown in Fig. 8. Therefore, when the charged object is placed on the charging plate after the induction heating device is turned on , the user can quickly and easily check the type of loaded object to determine if the object is compatible with induction heating.

Furthermore, according to the present disclosure, the charged object having the property of inductive heating can be automatically recognized by the detection method as described above. Therefore, the inductive heating device can be activated without the user performing an operation of pressing a heating region selection button. Accordingly, there is an advantage that the comfort for the user can be significantly increased.

Aspects of the present disclosure provide an induction heating device capable of accurately and quickly discriminating the type of charged object while consuming less power than a conventional one, and provide a method for controlling the induction heating device. Furthermore, aspects of the present disclosure provide an induction heating device configured to simultaneously perform measurement of the temperature of the charged object and determination of the type of the charged object, and provide a method for controlling the induction heating device.

Furthermore, aspects of the present disclosure provide an induction heating device whereby the user can quickly and intuitively check whether the corresponding charged object has the property of inductive heating, and the user can skip the operation of pressing a select button. of heating region when the user charges the charged object, and further provide a method for controlling the induction heating device.

Aspects of the present disclosure are not limited to the aspects mentioned above. Other aspects of the present disclosure, as not mentioned above, can be understood from the above descriptions and more clearly understood from the embodiments of the present disclosure. Furthermore, it will be readily appreciated that aspects of the present disclosure may be embodied by features and combinations thereof as described in the claims.

Aspects of the present disclosure provide an induction heating device with a novel charged object sensor for accurately determining a type of charged object while consuming less power compared to other induction heating apparatus. The charged object sensor according to the present disclosure may have a cylindrical hollow body with a sensing coil wound on one side. outside of it. Furthermore, a temperature sensor may be housed in a receiving space formed within the charged object sensor body.

The charged object sensor having such a configuration may be provided in a central region of the work coil and concentric with the coil. The sensor can determine the type of charged object placed at the position corresponding to the work coil, and at the same time measure the temperature of the charged object.

The detection coil included in the charged object sensor according to the present disclosure may have fewer rotation counts and a shorter total length than the work coil. Accordingly, the sensor according to the present disclosure can identify the type of charged object while consuming less power compared to the charged object discrimination method using the work coil.

Also, as described above, the temperature sensor can be accommodated in the internal space of the charged object sensor according to the present description. Accordingly, the temperature can be measured, and the type of the charged object can be determined at the same time by using the sensor having a relatively smaller size and volume.

In accordance with aspects of the present disclosure, a combination of current sensing using the work coil and inductive sensing using the charged object sensor can allow accurate and rapid discrimination of the type of charged object. In this regard, inductive sensing can consume less power than current sensing. According to the present disclosure, firstly, inductive detection can be performed periodically after power can be applied to the induction heating device, to detect a specific object with inductive heating property. Next, current detection of the specific object having the property of inductive heating can be performed to check whether the specific object has the property of inductive heating. Thus, when the user simply places the charged object on the charging plate of the induction heating device, the device can allow the user to quickly and intuitively confirm whether the corresponding charged object has the property of inductive heating. Therefore, an operation of pressing the heating region selection button by the user after loading the loaded object can be omitted.

According to a first aspect of the present disclosure, an induction heating device may comprise: a charging plate on which a charged object may be placed, wherein the charging plate may have at least one heating region; at least one work coil provided below the charging plate for heating a corresponding charged object using inductive current, wherein each work coil may correspond to one of the heating regions; a charged object sensor provided concentrically with each work coil, wherein the sensor includes a detection coil, each work coil surrounding each sensor; and a control unit configured to determine whether a charged object placed in a corresponding heating region has an inductive heating property by at least one of current detection using a corresponding work coil, and inductive detection using a corresponding charged object sensor .

In one embodiment of the device, the at least one heating region includes a plurality of heating regions, wherein the control unit can be configured to repeatedly perform inductive detection of all heating regions in a predetermined detection interval. In an embodiment of the device, after determining from the inductive detection result that a corresponding charged object is determined to have the property of inductive heating, the control unit may be configured to perform current detection of the corresponding charged object using a function of the corresponding work coil.

In one embodiment of the device, the at least one heating region may include a plurality of heating regions, wherein the control unit may be configured to perform current sensing of all heating regions upon initial application of power to the device. device. In an embodiment of the device, the control unit may be configured to allow a corresponding work coil to perform the heating operation of a corresponding charged object only when said corresponding charged object is determined from the current detection result to have inductive heating property.

In an embodiment of the device, when an eddy current magnitude generated in a corresponding charged object in current detection when current is applied to a corresponding work coil exceeds a first predetermined reference value, the control unit may be configured to determine that the corresponding charged object has an inductive heating property. In an embodiment of the device, when a phase value of the current measured in a corresponding detection coil in inductive detection when current is applied to the corresponding detection coil exceeds a second predetermined reference value, the control unit may be configured to determine that a corresponding charged object has an inductive heating property.

In an embodiment of the device, when an inductance value measured at a corresponding detection coil in inductive detection when current is applied to the corresponding detection coil exceeds a third value With a predetermined reference value, the control unit may be configured to determine that a corresponding charged object has an inductive heating property. In an embodiment of the device, an amount of power consumed for inductive sensing may be less than an amount of power consumed for current sensing.

According to a second aspect of the present disclosure, a method of controlling an induction heating device may be provided, wherein the device has at least one heating region, wherein each heating region corresponds to each charged object. provided therein; wherein the method may comprise: inductively detecting each region of heating; upon determining based on inductive detection that a specific charged object provided in a specific heating region has an inductive heating property, performing current detection of the specific heating region; and after determining based on the current detection that the specific charged object has an inductive heating property, performing the heating operation of the specific charged object.

In an embodiment of the method, the at least one heating region includes a plurality of heating regions, wherein the method may further comprise: performing initial current sensing of all heating regions after an initial application of power to the device ; determining based on the initial current detection whether each charged object provided in each heating region has an inductive heating property; and performing the heating operation on a charged object determined to have the property of inductive heating. In one embodiment of the method, the inductive detection of each region of heating may be repeated at a predetermined interval.

According to aspects of the present disclosure, the induction heating device and the method for controlling the same may be capable of accurately and quickly discriminating the type of charged object while consuming less power than a conventional one. Furthermore, according to aspects of the present disclosure, the induction heating device and the method for controlling the same can simultaneously perform measurement of the temperature of the charged object and determination of the type of the charged object. Furthermore, the induction heating device and the method for controlling the same can allow the user to quickly and intuitively check whether the corresponding charged object has the property of inductive heating, and can allow the user to skip the operation of pressing a selection button. heating region when the user charges the charged object.

In the foregoing description, numerous specific details are set forth in order to provide a complete understanding of the present disclosure. The present disclosure may be practiced without some or all of these specific details. Examples of various embodiments have been illustrated and described above. It will be understood that the description herein is not intended to limit the claims to the specific embodiments disclosed. On the contrary, it is intended to cover alternatives, modifications and equivalents as may be included within the scope of the present disclosure as defined by the appended claims.

It will be understood that when an element or layer is referred to as being "on" another element or layer, the element or layer may be directly on another element or layer or intervening elements or layers. In contrast, when an element is referred to as being "directly above" another element or layer, no intervening elements or layers are present. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It will be understood that while the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers, and/or sections, these elements, components, regions, layers, and/or sections should not be limited. for these terms. These terms are only used to distinguish one element, component, region, layer, or section from another region, layer, or section. Therefore, a first element, component, region, layer, or section could be referred to as a second element, component, region, layer, or section without departing from the teachings of the present disclosure.

Spatially relative terms, such as "lower", "higher", and the like, may be used here to make it easier to describe the relationship of one element or feature to other element(s) or feature(s) such as is illustrated in the figures. It will be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. For example, if the device is turned upside down in the figures, elements described as "lower" relative to other elements or features would be oriented "upper" relative to other elements or features. Thus, the exemplary term "lower" can encompass both an above and below orientation. The device may be oriented differently (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an", and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the terms "comprise", "comprising", "includes" and/or "including", when used herein, specify the presence of indicated features, integers, steps, operations, elements, and/or components, but does not exclude the presence or addition of one or more of the indicated features, integers, steps, operations, elements, components, and /or groups thereof.

Embodiments of the disclosure are described herein with reference to cross-sectional illustrations which are schematic illustrations of idealized embodiments of the disclosure. As such, variations from the shapes of the illustrations are to be expected as a result of, for example, manufacturing techniques and/or tolerances. Thus, the embodiments of the disclosure should not be construed as being limited to the particular shapes of the regions illustrated herein, but should include deviations in shapes resulting from, for example, manufacturing.

Unless otherwise defined, all technical terms (including technical and scientific terms) used herein have the same meaning as is commonly understood by one of ordinary skill in the art to which this disclosure pertains. It is further understood that terms, as defined in commonly used dictionaries, are to be construed as having a meaning that is consistent with their meaning in the context of the relevant art and are not to be construed in an idealized or overly formal sense, unless expressly so defined herein.

Any reference in this specification to "an embodiment," "the embodiment," "exemplary embodiment," etc., means that a particular feature, structure, or feature described in connection with the embodiment is included in at least one embodiment of the embodiment. divulgation. Occurrences of such phrases in various places in the specification are not necessarily all referring to the same embodiment. In addition, when a particular characteristic, structure, or feature is described in connection with any embodiment, it is stated to be within the purview of one skilled in the art. the technique of effecting said characteristic, structure or trait in connection with other embodiments.

Although embodiments have been described with reference to a number of illustrative embodiments thereof, it is to be understood that numerous other modifications and embodiments may be envisioned by those skilled in the art, which will fall within the scope of the principles of this disclosure. More particularly, variations and modifications in the component parts and/or arrangements of the present invention are possible within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art.

Claims (9)

1. An induction heating device, comprising: a charging plate (106) for placing a charged object thereon, the charging plate (106) having at least one heating region; at least one work coil (202, 204) disposed below the charging plate (106), wherein the work coil (202, 204) corresponds to a heating region; a charged object sensor (220) disposed in a central region of the work coil (202, 204); Y a control unit (602) configured to determine whether a charged object having an inductive heating property is placed in the heating region by inductive detection using the charged object sensor (220) corresponding to the heating region and current detection using the work coil (202, 204) corresponding to the heating region, characterized because: upon determination of the inductive detection result that a charged object having the property of inductive heating is placed in the heating region, the control unit 602 is configured to perform current detection of the corresponding charged object using the corresponding work coil (202, 204), wherein only by determining that a charged object having inductive heating property is placed in the heating region from the current detection result, the control unit (602) is configured to perform an object heating operation charged by the corresponding work coil (202, 204), wherein an amount of power consumed for inductive detection is set to be less than the amount of power consumed for current detection. The device of claim 1, wherein the control unit (602) is configured to repeatedly perform inductive detection of the heating region at a predetermined detection interval. The device according to any one of the preceding claims, wherein the at least one heating region includes a plurality of heating regions, and the control unit (602) is configured to perform current detection of all regions of heating after an initial application of power to the device. The device according to any one of the preceding claims, wherein, on detection of current, current is applied to the work coil (202, 204), and when a magnitude of an eddy current generated in the object charged exceeds a first predetermined reference value, the control unit 602 is configured to determine that the charged object has inductive heating property. The device according to any one of the preceding claims, wherein, on inductive sensing, current is applied to the sensing coil (222), and when a phase value of the current measured in the coil (222 ) of detection exceeds a second predetermined reference value, the control unit 602 is configured to determine that the charged object has inductive heating property. The device according to any one of the preceding claims, wherein, on inductive sensing, current is applied to the sensing coil (222), and when a measured inductance value across the sensing coil (222) exceeds a third predetermined reference value, the control unit 602 is configured to determine that the charged object has inductive heating property. 7. A method of controlling an induction heating device, wherein the method comprises: inductively detecting (902) at least one region of heating; characterized by the stages of: detect current (904) if it is determined based on the inductive detection result that a charged object having an inductive heating property is disposed in the heating region; Y perform a heating operation (906) if the current detection result confirms that the charged object having the property of inductive heating is disposed in the heating region, in which an amount of power consumed for inductive detection is set to be less than the amount of energy consumed for current detection. 8. The method of claim 7, wherein the method further comprises: performing initial current detection (1004) of all of the at least one heating region after an initial application of power (1002) to the device; determining (1006) based on the initial current detection (1004) whether a charged object having inductive heating property is disposed in the heating region; Y performing a heating operation (1016) of the charged object. The method of claim 7 or 8, wherein inductively detecting (902) the at least one region of heating includes repeatedly performing inductive detection of all of the at least one region of heating in a predetermined detection interval .